code: def test_result_type(self, xp, dtype1, dtype2):
      input1 = _generate_type_routines_input(xp, dtype1, self.obj_type1)
      input2 = _generate_type_routines_input(xp, dtype2, self.obj_type2)
      ret = xp.result_type(input1, input2)
      assert isinstance(ret, numpy.dtype)
      return ret
  
file_path: cupy/tests/cupy_tests/test_type_routines.py
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestResultType obj's underlying member method code with example usage: obj.test_result_type(xp, dtype1, dtype2) and returns: ret